Because the result of the bathroom scale is different from doctor’s office scale, then, the scale in your bathroom is not valid and unreliable.
Every weight scale must always produced the same result for the mass measured thereon.
However, various conditions like rust, being overused can result to the inaccuracy of the result produced by some weight-scale.
Also, it is expected that the scale in doctor’s office which has the ‘gold standard’ of scales will be more valid and reliable because of the nature of what its been use for in the hospital.
Therefore, in conclusion, the scale in your bathroom is not valid and unreliable.
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